Fix snmp:config() when run from Elixir

[mneumann]

A device read in Elixir returns a binary, not a char list (as in Erlang).

Quoting Jose Valim: "Any device may return a binary on read, therefore, all Erlang/Elixir code needs to be aware of this possibility and handle it accordingly."

See: elixir-lang/elixir#14757

How to reproduce the bug:

~ % iex
Erlang/OTP 28 [erts-16.0.2] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [jit:ns]

Interactive Elixir (1.18.4) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)> :snmp.config()

Simple SNMP configuration tool (version 5.19)
------------------------------------------------
Note: Non-trivial configurations still has to be
      done manually. IP addresses may be entered
      as dront.ericsson.se (UNIX only) or
      123.12.13.23
------------------------------------------------

y
{:error,
 {:function_clause,
  [
    {:lists, :delete, [10, "y\n"], [file: ~c"lists.erl", line: 725]},
    {:snmp_config, :ask, 3, [file: ~c"snmp_config.erl", line: 1683]},
    {:snmp_config, :snmp_agent2, 0, [file: ~c"snmp_config.erl", line: 173]},
    {:snmp_config, :config_agent, 0, [file: ~c"snmp_config.erl", line: 159]},
    {:snmp_config, :config2, 0, [file: ~c"snmp_config.erl", line: 130]},
    {:snmp_config, :config, 0, [file: ~c"snmp_config.erl", line: 117]},
    {:elixir, :eval_external_handler, 3, [file: ~c"src/elixir.erl", line: 386]},
    {:erl_eval, :do_apply, 7, [file: ~c"erl_eval.erl", line: 924]}
  ]}}

[github-actions]

CT Test Results

  2 files   24 suites   47m 54s ⏱️
496 tests 468 ✅  28 💤 0 ❌
652 runs  516 ✅ 136 💤 0 ❌

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// Erlang/OTP Github Action Bot

[Whaileee]

Hi, thanks for the contribution. This will be fixed in next release, but if you want to use it now you can set your io in iex to return list instead with :io.setopts(:standard_io, [{:binary, false}]).
Best regards,
Konrad